不同形态SiO_2的性质研究

STUDY OF PROPERTY OF SILICA IN DIFFERENT FORMS

本文比较了晶态ＳｉＯ＿２和无定形ＳｉＯ＿２的性质。结果表明，无定形ＳｉＯ＿２的溶解度大于α－石英。在ｐＨ＞３的范围内，ＳｉＯ＿２粒子表面带负电荷，α－石英粒子表面ξ电位高于无定形ＳｉＯ＿２粒子，ＥＳＲ谱表明，α－石英晶体被研磨后，粉尘粒子表面产生了自由基，而研磨无定形ＳｉＯ＿２则无自由基产生。α－石英粉尘粒子表面ξ电位大，粒子表面存在自由基与它的细胞毒性大是相一致的。

The property of c ystalline SiO_2 and amorpbous SiO_2 is studied by detecting the surface property of SiO_2 partical and the action of SiO_2 dust to the alveolar macrophage.The results are mainlyas follows.The solubility of amorphous SiO_2 is higher than that of α quartz,In the ranger of PH>3.surface of SiO_2 practicle changes negative change,The electric potentials of α quaroz is higher than that of amorphous SiO_2 ESR spectrum shows that grinding α quartz in air products free radical.but grinding amorphous SiO_2 don't product free radical.High electric potentials and free radical of α quartz particles surface accord with its great cytotoxicity.